Sit-up exercise support



FIG. 1 is a top perspective view of sit-up exercise support showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a front elevational view thereof, the rear view being a mirror image. 

The ornamental design for sit-up exercise support, as shown and described. 